What should be done with samples from a Legionella-positive outlet?

Sending samples from a Legionella-positive outlet to the lab for further testing is the appropriate action because it allows for comprehensive analysis of the sample, which is critical in managing and mitigating the risk of Legionella proliferation. These samples can provide valuable insights into the strain of Legionella present, its concentration, and any potential links to outbreaks of Legionnaires' disease. This further testing is essential for determining the extent of contamination and formulating an effective response plan to address and manage the situation.

This approach aligns with best practices in public health and safety, which prioritize thorough investigation and testing when dealing with potential health threats. Proper lab analysis can guide the necessary remedial actions, such as system disinfection or other interventions required to reduce the risk of exposure to Legionella.